TB_chapter24 - Chapter 24, Wave Optics CHAPTER 24...

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Chapter 24, Wave Optics C HAPTER 24 Conceptual Questions C1. In a Young’s double-slit experiment, both the wavelength and the slit separation are increased by 50%. What happens to the distance between two adjacent bright fringes? a. It increases by 50%. b. It decreases by 50%. c. The distance stays the same. d. The distance increases by a 100% or more. C2. In a Young’s double-slit experiment, what happens to the angular separation between the fringes when the wavelength is increased at the same time that the slit separation is decreased? a. It increases. b. It decreases. c. It stays the same. d. The relative sizes of the changes need to be known before a definite answer can be given. C3. A Young’s double-slit experiment is performed in air and then the apparatus is submerged in water. What happens to the fringe separation, and what can be used to explain the change, if any? a. The separation stays the as it is the same experiment independent of the medium. b. The separation decreases because the frequency of the light decreases in the water. c. The separation increases because the wavelength of the light increases in the water. d. The separation decreases because the wavelength of the light decreases in the water. C4. Diffraction grating #1 has half the lines/cm that diffraction grating #2 does. When used with a certain wavelength of light, both gratings give first order maxima. Which of the following statements is true for the same wavelength of light. a. Both gratings must also give second order maxima. b. Grating #1 must give a second order maximum. c. Grating #2 must give a second order maximum. d. It is possible that neither grating gives a second order maximum. C5. Light travels from outside a building to inside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case? a. No phase change occurs at either the inside surface or the outside surface of the glass. b. A 180 o phase change occurs at both the inside surface and the outside surface. c. A 180 o phase change occurs at the inside surface but not at the outside surface. d. A 180 o phase change occurs at the outside surface but not at the inside surface. 155
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Chapter 24, Wave Optics 24.2 Young’s Double-Slit Experiment 1. Interference effects observed in the early 1800s were instrumental in supporting a concept of the existence of which property of light? a. polarization b. particle nature c. wave nature d. electromagnetic character 2. If a wave from one slit of a Young’s double-slit set-up arrives at a point on the screen one wavelength behind the wave from the other slit, what is observed at that point? a. dark fringe b. bright fringe c. multi-colored fringe d. gray fringe, neither dark nor bright 3. A Young’s double slit has a slit separation of 2.50 × 10 - 5 m on which a monochromatic light beam is directed. The resultant bright fringes on a screen 1.00 m from the double slit are separated by 2.30 × 10 - 2 m. What is the wavelength of this beam? (1 nm = 10
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This note was uploaded on 01/06/2012 for the course PHYS 201 taught by Professor Coffin during the Spring '09 term at Oregon State.

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TB_chapter24 - Chapter 24, Wave Optics CHAPTER 24...

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